Abstract: An apparatus for massaging a prostate gland by a contraction of a sphincter including a head and a resistor section. The head has a size suitable for fitting into a human rectum and through the sphincter. The head has a bulbous upper portion and a tapered section extending from the upper portion. The tapered section narrows in diameter from the upper portion. The resistor section is connected to a bottom of the head. The resistor section has a tapered surface widening from the bottom of the head. The tapered surface of the resistor section has an angle of taper smaller than an angle of taper of the tapered section at the bottom of the head. The resistor section is adapted to movably hold the tapered section of the head within the sphincter.